Basalt is made up from fine-grained interlocking crystals.It is black or dark grey in colour, and often contains vesicles – bubbles of gas trapped as the lava cooled.
Gabbro
Gabbro is made up from coarse-grained interlocking crystals.Its overall colour is dark grey but it often contains glassy or pale-coloured crystals of feldspar as well as dark minerals.
Pumice
Pumice
Pumice is formed when gas-rich magma froths up to form a sort of “mousse”.
Granite
Granite is is made of coarse-grained (5mm or so) interlocking crystals.
Basalt
Basalt is made up from fine-grained interlocking crystals.It is black or dark grey in colour, and often contains vesicles – bubbles of gas trapped as the lava cooled.
Gabbro
Gabbro is made up from coarse-grained interlocking crystals.Its overall colour is dark grey but it often contains glassy or pale-coloured crystals of feldspar as well as dark minerals.
Pumice
Pumice is formed when gas-rich magma froths up to form a sort of “mousse”.
Granite
Granite is is made of coarse-grained (5mm or so) interlocking crystals.